Resonant Transfer of Coherence in Nonzero Magnetic Field Between Atomic Levels of DifferentgFactors

Coherence transfer between atomic levels requires the matching of the Larmor frequencies. For levels with different $g$ factors this occurs only in zero magnetic field. By changing the $g$ factors through coupling with a nonresonant rf field, one can match the Larmor frequencies and make the transfer possible in nonzero magnetic fields. Resonances in the transfer appear, depending on the rf field amplitude. ${\mathrm{Rb}}^{87}$-${\mathrm{Cs}}^{133}$ spin-exchange experiments are reported which provide an illustration of the theory.